Centrifugal apparatus



Feb. 26, 1929.

H. LIST CENTRIFUGAL' APPARATUS Filed latch 24, 1928 W01 MW Patented Feb. 26, 1929.

UNITED STATES PATENT OFFICE.

. HERMANN LIST, OF NAUMBURG-ONTH E-SAALE, GERMANY.

cENrRIrUGAL APPARATUS.

Application filed latch 24, 1928, Serial No. 264,461, and in Germany February 10, 1927.

My invention relates to centrifugal apparatus. It is an object of my invention to eliminate certain drawbacks connected with the detachable caps forming part of such apparatus. To this end, instead of providing a completely detachable cap for the containcr of the apparatus, as usually, I provide a hinged cap and connect the supply and discharge pipes of the apparatus in coaxial relation to its hinge.

The cap of a centrifugal apparatus serves for deflecting and collecting the treated liquid issuing from the centrifugal bowl. The cap is arched and the inlet for the liquid which is to be treated in the bowl'is at the top of the cap.

It is indispensible that the ca should be detachable for inspecting and c eaning the centrifugal bowl. The apparatus is connected to piping comprising a pump and a tank and in the normal type it is necessary to.-

detach the connectionsof the cap which is effected by undoing rubber tubes or by taking apart packing faces. When the parts are reassembled, these connections must be made with the utmost care as otherwise they will not operate properly. On the other hand, the frequent handling of the cap involves rapid wear of the connections and packings, liability to inexact fitting, and the danger of the cap, particularly if it is made of'sheet metal, getting into contact with the rotating centrifugal bowl. As the bowl rotates at very high speed, heating and sparking are inevitable in case of such trouble, and explosions may occur with readily inflammable liquids.

These drawbacks are overcome in my invention according to which the cap is hinged to the casing in which the bowl is rotating and the connections of the pipes for supplying and discharging liquid are connected coaxially with the hinge of the cap. In this manner, I attain that the cap will be reliably returned to its initial position, that touching of the cap and the bowl due to poor fitting cannot occur and that the supply and discharge pipes are permanently held in the same position as it is not necessary to take apart any fittings etc.

A passage is provided in the caplfor supplying liquid to the bowl. At the inge of the cap, the supply pipe is provided with a tapering cup forming a valve seat which remains stationary with the pipe and is adapted to be closed automatically when thecap is open so as to prevent. loss of liquid in the case of careless handling of the apparatus. In apparatus as designed heretofore when the liquid supply pump is starteduntimely, the liquid it delivers is discharged into the open and lost.

In the drawing aflixcd to this specification and forming part thereof, a centrifugal apparatus equipped with in improved cap is illustrated diagraumiatical ly by way of example.

In the drawing,

Figs. 1 and 2 are elevations'ofthe appa ratus showing the cap opened and closed, respectively,

Fig. 3 is a section on the axis of the cap hinge, drawn to a larger scale.

Referring now to the drawing, '0 is a centrifugal bowl, 5 is a casing in which the bowl is rotating, a is a cap for closin the casing, 12, p are eyes formed in suitable brackets projecting from the cap a, d is a bracket projecting from the casing b, and c is a pin inserted in an eye of the bracket d and in the eyes 17, 7) ot the cap a. fis a tapered cup inserted in the eye p and connected with the suppl pipe g at one end, f is a port in the cup h is a passage in the cap a, the end of which is adapted to register with the port f when the cap is closed,- and m is a vertical discharge pipe at the end of the passage h arranged coaxially with respect to the bowl 0.

Z: is a discharge passage in the bracket of the othcrcye 7), Q is a coaxial bore conncctcd with the passage and 2' is a discharge pipc connected with the bore 1].

The supply pipe and the discharge pipe i are stationary, and suitable stufiing boxes g and z" are provided to make a tight connection between the pipes and the eyes p, p. Z is a throw-over nut for holding the cap a down on the casing b, n is a deflector at. the bottom of the cap a in connection with the passage k, and 0, 0 are arms secured to the casing b for supporting the pipes g and 2'.

In operation, the casing b is closed by the cap a as shown in Fig. 2 and the cap is held tightly on the casing b by the screw Z while the bowl 0 is rotating. The liquid to be treated is supplied through the pipe 9 as 1ndicated by the arrow in Fig. 3, and the passage h registering with the opening f in the cap f and discharging into the bowl 0 through the coaxial pipe m. The liquid after having been treated in the bowl 0 is ejected against the inner wall of the cap,

collected by the deflector n and conducted to the discharge pipe z through the passage is.

\Vhen it is desired to expose the bowl 0 the nut l is unscrewed and turned down as shown in Fig. 1, and the cap a is opened. The eyes 2, p rotate about the pin e in the bracket (1 but the supply and discharge pipes g and i do not partake in the rotation, being retained by the arms 0, nor does the cup f partake'in the rotation of the cap and therefore the port f and the passage h are moved out of register so that loss of liquid by untimely starting of the supply pump is prevented.

I wish it tobe understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

I claim:

1. A centrifugal apparatus comprising a rotary bowl, a casing surrounding said bowl, a cap hinged to said casing, and liquid pipes arranged coaxially with respect to the hinge of said cap.

2. A centrifugal apparatus comprising a rotary bowl, a casing surrounding said bowl, a cap hinged to said casing, liquid pipes arranged coaxially with respect to the hinge of said cap, and means for closing one of said pipes in the open position of said cap.

3. A centrifugal apparatus comprising a rotary bowl, a casing surrounding said bowl, a cap hinged to said casing, liquid pipes arranged coaxially with respect to the hinge of said cap, and a tapering cut secured on theinner end of one of said pipes comprising a port, said cap comprising a passage adapted to register with said port only in :the closed position of said cap.

In testimony whereof I afiix my signature.

' HERMANN LIST. 

